Abstract
An analytic approach for the estimation of the phase
and amplitude imbalances caused by component mismatches and
parasitic magnetic fields in two popular quadrature LC oscillators
is presented. Very simple and closed-form equations are derived,
proving that, although the two topologies share the same small
signal circuit, they display very different sensitivities to the men-
tioned sources of imbalance. Moreover, it is shown that parasitic
inductors coupling, overlooked up to date, plays a key ro